104 ANNALS OF SCOTTISH NATURAL HISTORY 



back of the smooth nerve (the "Aussenzellen " of German 

 authors in describing the nerve-section) ; these are quite well 

 shown in the Fort William plant. 



Fissidens osmundoides, Hedw. A well preserved fragment or two. 



Grimmia, sp. Three or four fragments of a Grimmia with narrow 

 leaves, of the triclwphylla type, but with the cells nearly all 

 remaining incrassate and sinuose to the base. Mr. Nicholson 

 suggests G. Miihlenbeckii, with which I think it might well be 

 identified. I have, however, seen forms of what is probably 

 Grimmia robusta, Ferg., with a similar areolation, and it is 

 perhaps not quite safe to attempt a final determination. 



Rhacomitrium heterostichum, var. (= R. affine, Lindb.). One of 

 the forms with short upper areolation and very short, incon- 

 spicuous hair-point. 



R. canescens, Brid. Frequent small fragments. 



Bryum pseudo-triqiietrum, Schwaeg. Two small but well preserved 

 fragments, one showing clearly an inflorescence which I was 

 able to dissect and determine as $ . 



Mnium hornum, L. A single well preserved stem. 

 Neckera pumila, Hedw. Numerous small fragments. 



N. complanata, Hiibn. In various forms besides the typical one. 

 The leaves in one were rather long and comparatively acute, 

 with the margin often denticulate for some distance downwards. 

 Another had the leaves often very tapering and acute or even 

 acuminate, but quite entire, the cells rather narrow. Still 

 another had the leaves very wide above and obtuse. 



Antitrichia curtipendula, Brid. The bulk of the material consisted 

 of this moss, often in large fragments, and perfectly well pre- 

 served with the exception of being absolutely blackened. 



Thuidium tamarisanum, B. and S. Several scraps, and one fairly 

 complete and wonderfully preserved frond. 



T. delicatulum, Mitt. A single stem, with stem-leaves and branch- 

 leaves in good condition and quite characteristic. 



T. Philiberti, Limpr. Several fragmentary stems. The form and 

 arrangement of the branch-leaves was quite different from that 

 of the preceding. That alone would not, of course, preclude 

 the interpretation that they represented two forms of the same 

 species ; but the form of the stem-leaves admits no doubt on 

 the matter. The filiform apex of these leaves, as is only 

 natural, was not to be found remaining ; but their outline was 

 quite characteristic. In the smaller forms of T. Philiberti the 

 stem leaves do not differ very markedly in outline from those 

 of T. delicatulum ; but in the larger, better developed forms, 



